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A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime.

A white, crystalline substance,

ative sulphate of barium, a mineral occurring in transparent, colorless, white to yellow crystals (generally tabular), also in granular form, and in compact massive forms resembling marble. It has a high specific gravity, and hence is often called heavy spar. It is a common mineral in metallic veins.…

A mineral of a white or gray color, occurring massive or crystallized. It is a compound of the carbonates of barium and calcium.

Relating to, or forming, the base. Basal cleavage. See under Cleavage. -- Basal plane (Crystallog.), one parallel to the lateral or horizontal axis.

The basal plane of a crystal.

Said of crystalline rocks which contain a relatively low percentage of silica, as basalt. Basic salt (Chem.), a salt formed from a base or hydroxide by the partial replacement of its hydrogen by a negative or acid element or radical.

m sea water, by evaporation in shallow pits or basins, by the heat of the sun; the large crystalline salt of commerce. Bacon. Ure.

aking overcoats. Beaver rat (Zoöl.), an aquatic ratlike quadruped of Tasmania (Hydromys chrysogaster). -- Beaver skin, the furry skin of the beaver. -- Bank beaver. See under 1st Bank.

, and the American kingbird. -- Bee flower (Bot.), an orchidaceous plant of the genus Ophrys (O. apifera), whose flowers have some resemblance to bees, flies, and other insects. -- Bee fly (Zoöl.), a two winged fly of the family Bombyliidæ. Some species, in the larval state, are parasitic upon bees. -- Bee garden, a…

The Myzantha melanophrys of Australia.

Minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.

A transparent crystalline substance,

A transparent crystalline substance, C6H5.CO.NH2, obtained by the action of ammonia upon chloride of benzoyl, as also by several other reactions with benzoyl compounds.

A yellowish crystalline substance, C6H5.CO.CO.C6H5, formed from benzoin by the action of oxidizing agents, and consisting of a doubled benzoyl radical.

ation or decoction. It is also found in the urine of infants and herbivorous animals. It crystallizes in the form of white, satiny flakes; its odor is aromatic; its taste is pungent, and somewhat acidulous. -- Benzoic aldehyde, oil of bitter almonds; the aldehyde, C6H5.CHO, intermediate in composition between benzoic…

A white crystalline substance, C14H12O2, obtained from benzoic aldehyde and some other sources.

A white crystalline powder used as an intestinal antiseptic; beta-naphthol benzoate.

an intestinal antiseptic and as a substitute for creosote in phthisis. It is a colorless crystalline pewder.

of a double twelve-sided pyramid; -- so called because the planes of this form occur on crystals of beryl.